PuTTY 0.63, released today, fixes four security holes in 0.62 and before: vuln-modmul, vuln-signature-stringlen, vuln-bignum-division-by-zero, private-key-not-wiped. Other than that, there are mostly bug fixes from 0.62 and a few small features.One of the new "small" features is the scroll-back buffer now defaults to 2,000 lines.